A DCS control system for feedstock delivery in a pulverized coal gasification process
Patent Information
- Application Number
- CN202611435445.1
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2026-09-16
- Publication Date
- 2026-10-27
AI Technical Summary
[0003]现有技术中，由于粉煤密相输送具有脉冲、波动、间歇性扰动特征，作业时瞬时煤量波动幅度较大，容易引发炉内空分供氧压力或流量小幅扰动现象，造成瞬时配比出现虚高或虚低的影响，导致氧煤比出现频繁偏移的问题，而氧煤比出现频繁偏移时，炉内更容易出现炉温超高、耐火砖冲刷加剧的问题，即氧煤比偏移误差产生时，气化炉内更容易产生突发性的瞬时欠氧，致使煤粉不完全燃烧、积碳积灰，直接造成合成气品质下降，现有技术中通过采集瞬时煤量波动进行输送流量调节的作业模式，虽然可以降低一定的偏移误差，但由于气化炉存在较大的热惯性，对于氧气煤粉输送过程中的反应状态仅依赖瞬时流量数值作为调节参考数据时，仍出现与实际炉况无法充分匹配的状况，造成送料时的控制精准度不够理想
[0012]相较于现有技术，本发明的有益效果：通过设置煤粉端参数监测模块获取当前生产计划的煤粉总重量以及向气化炉内输送煤粉的通过流量，并由动态比值修正模块基于煤粉总重量以及煤粉输送流量分析当前投料完成时效，同时通过氧气流量参数监测模块获取当前气化炉多个进炉口输入的氧气流量，使动态比值修正模块基于获取的氧气流量以及煤粉输送流量测算瞬时氧煤比值，并输出至氧煤比执行操作平台，由氧煤比执行操作平台向煤粉以及氧气输入设备发送具体流量调试命令，进而通过对煤粉流量进行滚动平均运算，作为氧气流量设定值计算基准，彻底过滤密相输送脉冲干扰，保证气化炉整体反应配比恒定，同时在升降的负荷工况下，可根据负荷实际偏差量快速修正并调整氧煤比的滚动采集频率，进而实时且精准的调整至稳定氧煤比，消除煤粉脉冲扰动造成的炉温波动。
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Abstract
Description
Technical Field
[0001] This invention relates to the field of control system technology, specifically a DCS control system for feeding and conveying materials in pulverized coal gasification processes. Background Technology
[0002] The pulverized coal gasification process uses pure oxygen high-temperature gasification technology, with pulverized raw coal and high-pressure oxygen as the main reaction raw materials. In the gasifier, a high-temperature and high-pressure partial oxidation reaction is carried out to generate crude syngas mainly composed of carbon monoxide and hydrogen, which provides high-quality raw material gas for subsequent coal chemical plants.
[0003] In existing technologies, due to the pulsed, fluctuating, and intermittent disturbance characteristics of dense-phase pulverized coal conveying, the instantaneous coal quantity fluctuation is large during operation, which easily causes small disturbances in the oxygen supply pressure or flow rate in the furnace. This results in an artificially high or low instantaneous ratio, leading to frequent deviations in the oxygen-coal ratio. When the oxygen-coal ratio deviates frequently, the furnace temperature is more likely to be too high, and the erosion of refractory bricks will be intensified. In other words, when the oxygen-coal ratio deviation error occurs, the gasifier is more likely to experience sudden instantaneous oxygen deficiency, resulting in incomplete combustion of pulverized coal, carbon and ash accumulation, and directly causing a decline in syngas quality. Although the existing operating mode of adjusting the conveying flow rate by collecting instantaneous coal quantity fluctuations can reduce the deviation error to a certain extent, the gasifier has a large thermal inertia. When the reaction state during the oxygen-coal conveying process is only based on the instantaneous flow rate value as the adjustment reference data, it is still difficult to fully match the actual furnace conditions, resulting in insufficient control accuracy during feeding. Summary of the Invention
[0004] To address the problems in the prior art, the present invention provides a DCS control system for feeding and conveying materials in a pulverized coal gasification process.
[0005] The technical solution adopted by this invention to solve its technical problem is: a DCS control system for feeding and conveying materials in a pulverized coal gasification process, including a pulverized coal end parameter monitoring module, an oxygen flow parameter monitoring module, a dynamic ratio correction module, and an oxygen-coal ratio execution operation platform. The pulverized coal end parameter monitoring module and the oxygen flow parameter monitoring module are both signal-connected to the dynamic ratio correction module. The pulverized coal end parameter monitoring module is located on one side of the gasifier to be monitored and is used to obtain the total weight of pulverized coal in the current production plan and the flow rate of pulverized coal being fed into the gasifier. Based on the total weight of pulverized coal and the pulverized coal conveying flow rate obtained by the pulverized coal end parameter monitoring module, the dynamic ratio correction module analyzes the current feeding completion time. The oxygen flow parameter monitoring module is used to obtain the oxygen flow rate input at multiple inlets of the gasifier. The dynamic ratio correction module calculates the instantaneous oxygen-coal ratio based on the oxygen flow rate obtained by the oxygen flow parameter monitoring module and the pulverized coal conveying flow rate, and outputs it to the oxygen-coal ratio execution operation platform. The oxygen-coal ratio execution operation platform then sends specific flow rate adjustment commands to the pulverized coal and oxygen input devices. The dynamic ratio correction module includes an instantaneous ratio input unit, a rolling average processing unit, and a steady-state data storage unit. The instantaneous ratio input unit is used to set multiple acquisition time nodes and acquire the input flow rate of pulverized coal at multiple independent acquisition time nodes. The rolling average processing unit is used to calculate the average value of the pulverized coal input flow rate acquired at multiple independent acquisition time nodes. The steady-state data storage unit pre-inputs the oxygen input flow rate corresponding to the pulverized coal input flow rate. After reading the data stored in the steady-state data storage unit, the rolling average processing unit reads the corresponding oxygen input flow rate in the steady-state data storage unit based on the calculated average value of the current pulverized coal input flow rate. Then, the rolling average processing unit sends the oxygen input flow rate parameter to the oxygen-coal ratio execution operation platform to dynamically adjust the instantaneously input oxygen-coal ratio value.
[0006] Preferably, the dynamic ratio correction module further includes a load peak shaving unit. The load peak shaving unit is signal-connected to the pulverized coal end parameter monitoring module, the oxygen flow parameter monitoring module, and the instantaneous ratio input unit. When the total weight of pulverized coal in the production plan obtained by the pulverized coal end parameter monitoring module increases, and it is necessary to accelerate the delivery speed of pulverized coal and oxygen into the gasifier, the load peak shaving unit sends a sampling frequency adjustment signal to the instantaneous ratio input unit, and the instantaneous ratio input unit changes the sampling time node frequency.
[0007] Preferably, the load peak shaving unit includes a bidirectional signal transmission module, a microcontroller, a read / write memory, and a signal triggering module. The signal input terminal of the microcontroller is connected to the signal output terminal of the pulverized coal end parameter monitoring module, the oxygen flow parameter monitoring module, the instantaneous ratio recording unit, and the signal input terminal of the signal triggering module through the bidirectional signal transmission module. The signal output terminal of the microcontroller is connected to the read / write memory through the bidirectional signal transmission module, and the signal input terminal of the signal triggering module is connected to the read / write memory.
[0008] Preferably, after the bidirectional signal transmission module reads the total weight of coal powder in the current production plan entered in the coal powder end parameter monitoring module, the microcontroller performs numerical processing on the total weight of coal powder and inputs it into the read / write memory for storage. After the load peak shaving unit reads the total weight value of coal powder in the read / write memory, it determines whether the total weight value exceeds the preset value. After the microcontroller analyzes the growth rate of the total weight value, the microcontroller adjusts the sampling frequency reference value of the oxygen-coal ratio in the instantaneous ratio input unit a second time according to the growth rate of the value.
[0009] Preferably, the rolling average processing unit is signal-connected to the oxygen-coal ratio execution operation platform, and the oxygen-coal ratio execution operation platform is signal-connected to the flow regulating valve at the gasifier input end.
[0010] Preferably, the pulverized coal end parameter monitoring module includes a pulverized coal supply parameter quality monitoring unit and a pulverized coal feeding flow monitoring unit. The pulverized coal supply parameter quality monitoring unit is installed in the gasifier feeding hopper and is used to measure the total weight of pulverized coal to be conveyed in the gasifier feeding hopper. The pulverized coal feeding flow monitoring unit is installed in the gasifier feeding pipeline and is used to measure the conveying flow rate when the gasifier feeding pipeline conveys the pulverized coal to the gasifier.
[0011] Preferably, the oxygen flow parameter monitoring module includes industrial oxygen flow sensors installed at multiple inlets of the gasifier and a signal transmitter. The signal transmitter transmits the parameters collected by the multiple industrial oxygen flow sensors to the steady-state data storage unit. The steady-state data storage unit then summarizes the oxygen flow parameters in real time to obtain the total oxygen flow rate currently entering the gasifier, which is then used by the rolling average processing unit to calculate the adjustment difference of the current required oxygen-coal ratio.
[0012] Compared to existing technologies, the advantages of this invention are as follows: By setting up a coal powder end parameter monitoring module to obtain the total weight of coal powder in the current production plan and the flow rate of coal powder being transported into the gasifier, and by using a dynamic ratio correction module to analyze the current feeding completion time based on the total weight of coal powder and the coal powder transport flow rate, and by using an oxygen flow parameter monitoring module to obtain the oxygen flow rate input at multiple inlets of the gasifier, the dynamic ratio correction module calculates the instantaneous oxygen-coal ratio based on the obtained oxygen flow rate and coal powder transport flow rate, and outputs it to the oxygen-coal ratio execution operation platform. The oxygen-coal ratio execution operation platform sends specific flow rate adjustment commands to the coal powder and oxygen input equipment, and then uses the rolling average calculation of the coal powder flow rate as the calculation benchmark for the oxygen flow rate setpoint, thoroughly filtering dense phase transport pulse interference, ensuring a constant overall reaction ratio of the gasifier, and under fluctuating load conditions, the rolling acquisition frequency of the oxygen-coal ratio can be quickly corrected and adjusted according to the actual load deviation, thereby adjusting to a stable oxygen-coal ratio in real time and accurately, eliminating furnace temperature fluctuations caused by coal powder pulse disturbances. Attached Figure Description
[0013] The present invention will be further described below with reference to the accompanying drawings and embodiments.
[0014] Figure 1 This is a flowchart of the present invention.
[0015] Figure 2 This is a schematic diagram of the overall structure of the present invention.
[0016] In the diagram: 1. Pulverized coal end parameter monitoring module; 11. Pulverized coal supply parameter quality monitoring unit; 12. Pulverized coal feeding flow monitoring unit; 2. Oxygen flow parameter monitoring module; 3. Dynamic ratio correction module; 31. Instantaneous ratio input unit; 32. Rolling average processing unit; 33. Steady-state data storage unit; 34. Load peak shaving unit; 4. Oxygen-coal ratio execution operation platform. Detailed Implementation
[0017] To make the technical means, creative features, objectives and effects of this invention easier to understand, the invention will be further described below in conjunction with specific embodiments.
[0018] like Figures 1-2As shown, the present invention discloses a DCS control system for feeding and conveying materials in a pulverized coal gasification process, comprising a pulverized coal end parameter monitoring module 1, an oxygen flow parameter monitoring module 2, a dynamic ratio correction module 3, and an oxygen-coal ratio execution operation platform 4. Both the pulverized coal end parameter monitoring module 1 and the oxygen flow parameter monitoring module 2 are signal-connected to the dynamic ratio correction module 3. The pulverized coal end parameter monitoring module 1 is located on one side of the gasifier to be monitored and is used to obtain the total weight of pulverized coal in the current production plan and the flow rate of pulverized coal being fed into the gasifier. Based on the total weight of pulverized coal and the pulverized coal conveying flow rate obtained by the pulverized coal end parameter monitoring module 1, the dynamic ratio correction module 3 analyzes the current feeding completion time. The oxygen flow parameter monitoring module 2 is used to obtain the oxygen flow rate input at multiple inlets of the gasifier. The dynamic ratio correction module 3 calculates the instantaneous oxygen-coal ratio based on the oxygen flow rate obtained by the oxygen flow parameter monitoring module 2 and the pulverized coal conveying flow rate, and outputs it to the oxygen-coal ratio execution operation platform 4. The oxygen-coal ratio execution operation platform 4 then sends specific flow rate adjustment commands to the pulverized coal and oxygen input devices. The dynamic ratio correction module 3 includes an instantaneous ratio input unit 31, a rolling average processing unit 32, and a steady-state data storage unit 33. The instantaneous ratio input unit 31 is used to set multiple acquisition time nodes and obtain the input flow rate of pulverized coal at multiple independent acquisition time nodes. The rolling average processing unit 32 is used to calculate the average value of the pulverized coal input flow rate obtained at multiple independent acquisition time nodes. The steady-state data storage unit 33 has the oxygen input flow rate corresponding to the pulverized coal input flow rate pre-entered. After reading the data stored in the steady-state data storage unit 33, the rolling average processing unit 32 reads the oxygen input flow rate corresponding to the current pulverized coal input flow rate from the steady-state data storage unit 33. Then, it sends the oxygen input flow rate parameter to the oxygen-coal ratio execution operation platform 4 through the rolling average processing unit 32 to dynamically adjust the instantaneously input oxygen-coal ratio value.
[0019] In this embodiment, to address the issue that traditional pulverized coal feeding control systems only collect instantaneous coal quantity fluctuations for flow rate adjustment, while reducing some offset errors, the gasifier's significant thermal inertia means that relying solely on instantaneous flow rate values as adjustment references for the reaction state during oxygen-pulverized coal feeding still fails to adequately match the actual furnace conditions. This solution addresses this by setting up a pulverized coal end parameter monitoring module 1 to obtain the total weight of pulverized coal in the current production plan and the flow rate of pulverized coal fed into the gasifier. A dynamic ratio correction module 3 analyzes the current feeding completion time based on the total pulverized coal weight and pulverized coal feeding flow rate. Subsequently, an oxygen flow parameter monitoring module 2 obtains the current flow rate at multiple gasifier inlets. The input oxygen flow rate enables the dynamic ratio correction module 3 to calculate the instantaneous oxygen-to-coal ratio based on the acquired oxygen flow rate and pulverized coal conveying flow rate. After calculation, the value is directly output to the oxygen-to-coal ratio execution platform 4. The oxygen-to-coal ratio execution platform 4 sends specific flow rate adjustment commands to the pulverized coal and oxygen input devices. Then, by performing a rolling average calculation on the pulverized coal flow rate, it serves as the calculation benchmark for the oxygen flow rate setpoint, thoroughly filtering out dense phase conveying pulse interference and ensuring a constant overall reaction ratio in the gasifier. At the same time, under fluctuating load conditions, it can quickly correct and adjust the rolling acquisition frequency of the oxygen-to-coal ratio according to the actual load deviation, thereby adjusting to a stable oxygen-to-coal ratio in real time and accurately, eliminating furnace temperature fluctuations caused by pulverized coal pulse disturbances.
[0020] In this embodiment, the instantaneous ratio input unit 31 sets multiple acquisition time nodes and acquires the input flow rate of pulverized coal at multiple independent acquisition time nodes. Specifically, the instantaneous ratio input unit 31 sets 2 seconds as a basic acquisition cycle and reads the current instantaneous flow rate value of pulverized coal from the pulverized coal feed flow monitoring unit 12. Each minute is taken as a statistical cycle. The rolling average processing unit 32 calculates the average value of the total acquisition values within the one-minute statistical cycle. After calculating the average value of the pulverized coal input flow rate acquired at multiple independent acquisition time nodes, the rolling average processing unit 32 performs an average calculation on the total flow rate within the statistical cycle. Then, the rolling average processing unit 32 uses this rolling average value as an index key to perform a search and interpolation operation in the preset data table of the steady-state data storage unit 33 to read the ideal oxygen input flow rate required for this average pulverized coal flow rate.
[0021] In an optional embodiment of this example, the dynamic ratio correction module 3 further includes a load peak shaving unit 34. The load peak shaving unit 34 is connected to the pulverized coal end parameter monitoring module 1, the oxygen flow parameter monitoring module 2, and the instantaneous ratio input unit 31. When the total weight of pulverized coal in the production plan obtained by the pulverized coal end parameter monitoring module 1 increases and it is necessary to accelerate the conveying speed of pulverized coal and oxygen into the gasifier, the load peak shaving unit 34 sends a sampling frequency adjustment signal to the instantaneous ratio input unit 31, and the instantaneous ratio input unit 31 changes the sampling time node frequency.
[0022] In this embodiment, the steady-state data storage unit 33 is a non-volatile storage area (using EEPROM or SD card for storage). The steady-state data storage unit 33 contains the oxygen input flow rate corresponding to the coal powder input flow rate. Before the system runs, the operator writes the optimal matching relationship table between coal powder flow rate and oxygen flow rate, generated based on chemometrics and a large amount of historical best operating condition data, into this storage area. This data table contains multiple coal powder flow rate data points and their corresponding optimal oxygen flow rate settings, which are used by the rolling average processing unit 32 to quickly read out the ideal oxygen input flow rate required for the average flow rate after the coal powder has rolled.
[0023] In one optional embodiment of this example, the load peak shaving unit 34 includes a bidirectional signal transmission module, a microcontroller, a read / write memory, and a signal triggering module. The signal input terminal of the microcontroller is connected to the signal output terminal of the pulverized coal end parameter monitoring module 1, the oxygen flow parameter monitoring module 2, the instantaneous ratio recording unit 31, and the signal input terminal of the signal triggering module through the bidirectional signal transmission module. The signal output terminal of the microcontroller is connected to the read / write memory through the bidirectional signal transmission module, and the signal input terminal of the signal triggering module is connected to the read / write memory.
[0024] In one optional embodiment of this example, after the total weight of coal powder in the current production plan is read by the bidirectional signal transmission module, the total weight of coal powder is quantified by the microcontroller and stored in the read / write memory. After the load peak shaving unit 34 reads the total weight value of coal powder in the read / write memory, it determines whether the total weight value exceeds the preset value. After the microcontroller analyzes the growth rate of the total weight value, the microcontroller adjusts the sampling frequency reference value of the oxygen-coal ratio in the instantaneous ratio input unit 31 a second time according to the growth rate of the value.
[0025] In this embodiment, the bidirectional signal transmission module in the load peak shaving unit 34 first reads the total weight of pulverized coal in the current production plan recorded in the pulverized coal supply parameter quality monitoring unit 11. The microcontroller then performs scaling transformation and numerical processing on the total weight data and stores the processed result in the read / write memory. The microcontroller in the load peak shaving unit 34 continuously monitors the total weight value of pulverized coal in the read / write memory and determines whether the value exceeds the preset load benchmark value. When the total weight value increases and exceeds the preset value, the microcontroller calculates the percentage increase of the current total weight relative to the benchmark value according to the growth ratio analysis algorithm. Then, based on the calculated growth ratio, the microcontroller adjusts the sampling frequency benchmark value of the oxygen-coal ratio in the instantaneous ratio input unit 31. In this embodiment, when the load increases by more than 50%, the microcontroller sends a frequency adjustment signal to the instantaneous ratio input unit 31 through the signal trigger module, shortening the basic sampling cycle from 2s to 0.5s. This ensures that under high load or drastic load changes, the system can automatically increase the data sampling density and achieve more accurate and faster control response.
[0026] In one optional embodiment of this example, the rolling average processing unit 32 is signal-connected to the oxygen-coal ratio execution operation platform 4, and the oxygen-coal ratio execution operation platform 4 is signal-connected to the flow regulating valve at the input end of the gasifier.
[0027] In this embodiment, the signal input terminal of the oxygen-coal ratio execution platform 4 is connected to the output terminal of the rolling average processing unit 32. Its output terminal is hard-wired to the actuator of the flow regulating valve installed on the coal powder input pipeline and oxygen input pipeline of the gasifier via a control cable. At the same time, after receiving the oxygen input flow rate setting parameter from the dynamic ratio correction module 3, the oxygen-coal ratio execution platform 4 directly outputs it to the positioner of the oxygen pipeline regulating valve, thereby driving the valve to act, changing the valve opening of the oxygen pipeline regulating valve, and accurately controlling the oxygen flow rate entering the gasifier.
[0028] In an optional embodiment of this example, the pulverized coal end parameter monitoring module 1 includes a pulverized coal supply parameter quality monitoring unit 11 and a pulverized coal feeding flow monitoring unit 12. The pulverized coal supply parameter quality monitoring unit 11 is installed in the gasifier feeding hopper and is used to measure the total weight of pulverized coal to be conveyed in the gasifier feeding hopper. The pulverized coal feeding flow monitoring unit 12 is installed in the gasifier feeding pipeline and is used to measure the conveying flow rate when the gasifier feeding pipeline conveys the pulverized coal to the gasifier.
[0029] In this embodiment, the coal powder supply parameter quality monitoring unit 11 uses a support-type weighing method to calculate the weight of the coal powder feed hopper of the gasifier. By installing a weighing sensor under each support leg or support of the hopper, the weight of the entire hopper is directly borne. The total weight is obtained by measuring the force at multiple support points and summing the results. The working principle is that multiple weighing sensors detect the force at each support point in real time and convert the force signal into a digital weight signal. The signals from all weighing sensors are collected through a junction box and summed by a signal transmitter to obtain an analog signal representing the total weight of the hopper, which is then sent to the dynamic ratio correction module 3.
[0030] The powder feed flow monitoring unit 12 can be implemented using any of the existing capacitive solid mass flow meters, electromagnetic wave solid mass flow meters, or radiation solid mass flow meters. It is not a specific improvement of this solution. Its working principle is based on the dielectric constant of solid materials or microwave reflection effect. When coal powder particles flow over the probe surface, the sensor converts the physical change of particle flow into an electrical signal, which is then calculated into an instantaneous mass flow value by the built-in microprocessor. This high-frequency dynamic instantaneous flow signal is directly transmitted to the instantaneous ratio input unit 31 of the dynamic ratio correction module 3 as the original data source for subsequent rolling average calculation. Since its monitoring principle is not an improvement of this solution, its monitoring principle will not be described in detail.
[0031] In an optional embodiment of this example, the oxygen flow parameter monitoring module 2 includes industrial oxygen flow sensors installed at multiple inlets of the gasifier and a signal transmitter. The signal transmitter transmits the parameters collected by the multiple industrial oxygen flow sensors to the steady-state data storage unit 33. The steady-state data storage unit 33 then summarizes the oxygen flow parameters in real time to obtain the total oxygen flow rate currently input into the gasifier, which is then used by the rolling average processing unit 32 to calculate the adjustment difference of the current required oxygen-coal ratio.
[0032] In this embodiment, the industrial oxygen flow sensor in the oxygen flow parameter monitoring module 2 is a thermal mass flow meter or an orifice plate differential pressure flow meter. After independently installing the thermal mass flow meter or orifice plate differential pressure flow meter on the oxygen pipeline at the inlet of each gasifier, according to the requirement of a straight pipe section of ten times the pipe diameter before and five times the pipe diameter after, the signal transmitter is connected to a multi-channel data acquisition card. The multi-channel data acquisition card is responsible for synchronously collecting the instantaneous flow of oxygen in each branch. Finally, the signal transmitter packages and transmits the data to the steady-state data storage unit 33. The steady-state data storage unit 33 is equipped with a microcontroller calculation unit to calculate the total oxygen flow and write it into the storage, which serves as the current oxygen supply status parameter that the subsequent rolling average processing unit 32 can retrieve and compare in real time.
[0033] The working principle of this invention is as follows: After setting the basic acquisition period and statistical period through the instantaneous ratio input unit 31, the coal powder supply parameter quality monitoring unit 11 set in the gasifier feeding silo measures the total weight of coal powder to be transported in the gasifier feeding silo, and the powder feeding flow monitoring unit 12 set in the gasifier feeding pipeline measures the conveying flow rate when the coal powder is transported to the gasifier through the gasifier feeding pipeline. Then, the rolling average processing unit 32 calculates the coal powder input flow rate obtained at multiple independent acquisition time nodes (i.e., within the statistical period) and calculates its average value. Since the steady-state data storage unit 33 has the oxygen input flow rate corresponding to the coal powder input flow rate pre-entered, at this time, the rolling average processing unit 32 reads the data stored in the steady-state data storage unit 33, reads the oxygen input flow rate corresponding to the current coal powder input flow rate in the steady-state data storage unit 33, and then sends the oxygen input flow rate parameter to the oxygen-coal ratio execution operation platform 4 through the rolling average processing unit 32 to dynamically adjust the instantaneous ratio. The load peak shaving unit 34 reads the total weight of pulverized coal in the current production plan from the pulverized coal supply parameter quality monitoring unit 11 during operation, performs scaling transformation and numerical processing on the total weight data, and then stores the processed result in the read / write memory. The microcontroller in the load peak shaving unit 34 continuously monitors the total weight value of pulverized coal in the read / write memory and determines whether the value exceeds the preset load benchmark value. When the total weight value increases and exceeds the preset value, the microcontroller calculates the percentage increase of the current total weight relative to the benchmark value according to the growth ratio analysis algorithm. Based on the calculated growth ratio, the microcontroller adjusts the sampling frequency benchmark value of the oxygen-coal ratio in the instantaneous ratio input unit 31 for the second time. This completes the rapid correction and adjustment of the rolling sampling frequency of the oxygen-coal ratio under the load conditions of rising and falling loads, based on the actual load deviation, and adjusts it to a stable oxygen-coal ratio in real time and accurately, eliminating furnace temperature fluctuations caused by pulverized coal pulse disturbances.
[0034] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of the invention. Various changes and modifications can be made to the invention without departing from its spirit and scope, and all such changes and modifications fall within the scope of protection claimed by the present invention. The scope of protection of the present invention is defined by the appended claims and their equivalents.
Claims
1. A DCS control system for feeding and conveying materials in a pulverized coal gasification process, characterized in that, The system includes a pulverized coal end parameter monitoring module (1), an oxygen flow parameter monitoring module (2), a dynamic ratio correction module (3), and an oxygen-coal ratio execution operation platform (4). Both the pulverized coal end parameter monitoring module (1) and the oxygen flow parameter monitoring module (2) are signal-connected to the dynamic ratio correction module (3). The pulverized coal end parameter monitoring module (1) is located on one side of the gasifier to be monitored, used to obtain the total weight of pulverized coal in the current production plan and the flow rate of pulverized coal being fed into the gasifier. The dynamic ratio correction module (3) is based on the pulverized coal... After the end parameter monitoring module (1) obtains the total weight of coal powder and the coal powder conveying flow rate, it analyzes the current feeding completion time. The oxygen flow parameter monitoring module (2) is used to obtain the oxygen flow rate input at multiple inlets of the gasifier. The dynamic ratio correction module (3) calculates the instantaneous oxygen-coal ratio based on the oxygen flow rate and coal powder conveying flow rate obtained by the oxygen flow parameter monitoring module (2) and outputs it to the oxygen-coal ratio execution operation platform (4). The oxygen-coal ratio execution operation platform (4) sends specific flow rate debugging commands to the coal powder and oxygen input equipment. The dynamic ratio correction module (3) includes an instantaneous ratio input unit (31), a rolling average processing unit (32), and a steady-state data storage unit (33). The instantaneous ratio input unit (31) is used to set multiple acquisition time nodes and obtain the input flow rate of coal powder at multiple independent acquisition time nodes. The rolling average processing unit (32) is used to calculate the average value of coal powder input flow rate obtained at multiple independent acquisition time nodes. The steady-state data storage unit (33) has the oxygen input flow rate corresponding to the coal powder input flow rate pre-entered. After the rolling average processing unit (32) reads the data stored in the steady-state data storage unit (33), it reads the oxygen input flow rate corresponding to the current coal powder input flow rate using the calculated average value. Then, it sends the oxygen input flow rate parameter to the oxygen-coal ratio execution operation platform (4) through the rolling average processing unit (32) to dynamically adjust the instantaneous input oxygen-coal ratio.
2. The DCS control system for feeding and conveying materials in a pulverized coal gasification process according to claim 1, characterized in that: The dynamic ratio correction module (3) also includes a load peak shaving unit (34). The load peak shaving unit (34) is connected to the coal powder end parameter monitoring module (1), the oxygen flow parameter monitoring module (2), and the instantaneous ratio input unit (31) respectively. When the total weight of coal powder in the production plan obtained by the coal powder end parameter monitoring module (1) increases and it is necessary to accelerate the conveying speed of coal powder and oxygen into the gasifier, the load peak shaving unit (34) sends a sampling frequency adjustment signal to the instantaneous ratio input unit (31) and the instantaneous ratio input unit (31) changes the sampling time node frequency.
3. A DCS control system for feeding and conveying materials in a pulverized coal gasification process according to claim 2, characterized in that: The load peak shaving unit (34) includes a bidirectional signal transmission module, a microcontroller, a read / write memory, and a signal triggering module. The signal input terminal of the microcontroller is connected to the signal output terminal of the pulverized coal end parameter monitoring module (1), the oxygen flow parameter monitoring module (2), the instantaneous ratio recording unit (31), and the signal input terminal of the signal triggering module through the bidirectional signal transmission module. The signal output terminal of the microcontroller is connected to the read / write memory through the bidirectional signal transmission module, and the signal input terminal of the signal triggering module is connected to the read / write memory.
4. A DCS control system for feeding and conveying materials in a pulverized coal gasification process according to claim 3, characterized in that: After the bidirectional signal transmission module reads the total weight of coal powder in the current production plan entered in the coal powder end parameter monitoring module (1), the microcontroller performs numerical processing on the total weight of coal powder and inputs it into the read-write memory for storage. After the load peak adjustment unit (34) reads the total weight value of coal powder in the read-write memory, it determines whether the total weight value exceeds the preset value. After the microcontroller analyzes the growth rate of the total weight value, the microcontroller adjusts the sampling frequency reference value of the oxygen-coal ratio in the instantaneous ratio input unit (31) a second time according to the growth rate of the value.
5. A DCS control system for feeding and conveying materials in a pulverized coal gasification process according to claim 4, characterized in that: The rolling average processing unit (32) is signal-connected to the oxygen-coal ratio execution operation platform (4), and the oxygen-coal ratio execution operation platform (4) is signal-connected to the flow regulating valve at the input end of the gasifier.
6. A DCS control system for feeding and conveying materials in a pulverized coal gasification process according to claim 1, characterized in that: The coal powder end parameter monitoring module (1) includes a coal powder supply parameter quality monitoring unit (11) and a powder feeding flow monitoring unit (12). The coal powder supply parameter quality monitoring unit (11) is set in the gasifier feeding hopper and is used to measure the total weight of coal powder to be transported in the gasifier feeding hopper. The powder feeding flow monitoring unit (12) is set in the gasifier feeding pipeline and is used to measure the conveying flow when the gasifier feeding pipeline is transported to the gasifier.
7. A DCS control system for feeding and conveying materials in a pulverized coal gasification process according to claim 1, characterized in that: The oxygen flow parameter monitoring module (2) includes industrial oxygen flow sensors and signal transmitters installed at multiple inlets of the gasifier. The signal transmitter transmits the parameters collected by the multiple industrial oxygen flow sensors to the steady-state data storage unit (33). The steady-state data storage unit (33) then summarizes the oxygen flow parameters in real time to obtain the total oxygen flow rate currently input into the gasifier, which is then used by the rolling average processing unit (32) to calculate the adjustment difference of the current required oxygen-coal ratio.